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Message: <blockquote data-quote="ttocs" data-source="post: 957632" data-attributes="member: 11896">dimming problems are normally a sign of a bigger problem like low current caused by underdrive pullies or a bad alt unless you are running a high power stereo?  If you are running underdrives you are doing so at while hurting your alt.  By slowing it down it can't cool itself as well and its not uncommong to burn them out a couple years after the pullies are on.  If none of that is true, then maybe it is just a bad ground/charging system.  Use a minimum 4 awg and be sure to fuse it as close as you can to the alt as well as close to the battery.  While you are there upgrade the ground from the battery to the chassis(4-5 inches) and from the batt to the block.</blockquote>